EXACTLY; I was just about to write this, but read your email first, Phil.
Scott, you need to check the frequency of the Local Oscillator.
If they (USB, LSB, CW) are not on the right frequency, the filter will
attenuate so much signal that you won't get diddly for output. Jumper it
with a capacitor and you get full power.
If it is not the filter itself, then the frequency of the signal trying to
pass through is outside its bandpass. Something in the local oscillator has
gone south.
73
Rick, DJ0IP
-----Original Message-----
From: tentec-bounces@contesting.com [mailto:tentec-bounces@contesting.com]
On Behalf Of Phil Chambley, Sr.
Sent: Saturday, February 18, 2012 9:20 PM
To: Discussion of Ten-Tec Equipment
Subject: Re: [TenTec] Some progress made! --Omni D low to no
power--CrystalFilter
I haven't been in on this entire thread, but it seems to me he has a
sideband/mode switching issue. Here's why:
His rcv is OK....Question: Listening on LSB? What about other modes?
Question #2: No output. In what mode? Tune? CW? Different oscillator
frequency than the receive test?
I think he may have a problem with one of the crystals in the sideband
generator board, or possibly a trimmer or switching diode on that same
board, or on the Control board or Mode switch associated with
CW/Tune/LSB/USB.
Needs to run tests on other modes to check that out.
Phil C. Sr.
k4dpk
Phil C. Sr.
k4dpk
_________
----- Original Message -----
From: "Mike Bryce" <prosolar@sssnet.com>
To: "Discussion of Ten-Tec Equipment" <tentec@contesting.com>
Sent: Saturday, February 18, 2012 2:24 PM
Subject: Re: [TenTec] Some progress made! --Omni D low to no
power--CrystalFilter
> Scott,
>
> You see why that was such a head scratcher for me. Rick may have seen a
> filter go bad, but since TT uses the filter for rec and TX, and the rec
> worked just fine. There's something else (no kidding!) wrong.
>
> If the filter was open, then you'd need to be in the shadow of the W1AW
> tower to be able to hear much, if anything.
>
> When you subed in the 1.8 filter, that now points to something else beside
> a bad filter.
>
>
> Does the output on the TX mixer show short when you pull the board from
> the rig? It shouldn't
>
> however plug in the board and the output of the TX mixer goes to the
> bandpass filter. Here, the output of the TX mixer goes the bandpass input.
> On bands 7 mhz and up, the input of the bandpass board will show dc
> continuity. ( the output of the TX mixer goes into the input of the
> bandpass board)
>
> start looking for shorted cables, loose cable, the simple over looked
> things. Use that scope and unplug the TX mixer and see if the signal out
> of the filter pops up, or stays the same.
>
> Keep the group informed
>
> mike, wb8vge
>
>
>
> On Feb 18, 2012, at 2:02 PM, Scott Sheppard wrote:
>
>> So the next stage of the problem would seem to be finding out why teh
>> crystal is baving linke it is...here is the situation:
>>
>> 1. Normal filter left in place
>>
>> -great receive, no problem...
>> -virtually no output at all (as has been beat to death already)
>>
>> 2. Filter removed and jumpered with a .01 capacitor
>>
>> -wide open receive as expected, lots of signals
>> -full power TX at all the stages...100 watts out
>>
>> 3. 1.8 khz filter fitted
>>
>> -receive ok albeit narrower
>> -virtually no TX power at all (as per situation #1)
>>
>>
>
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>
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